#pragma once 
#include<iostream>
#include<string>
#include<set>
#include<cstdio>
#include<cstring>
#include"Log.hpp"
#include"InetAddr.hpp"

class Command
{
public:
    Command() 
    {
        _safe_command.insert("ls");
        _safe_command.insert("touch");
        _safe_command.insert("pwd");
        _safe_command.insert("whoami");
        _safe_command.insert("which");
    }
    ~Command() {}
    bool SafeCheck(const std::string &cmdstr)
    {
        for(auto &cmd:_safe_command)
        {
            if(strncmp(cmd.c_str(),cmdstr.c_str(),cmd.size())==0)
            {
                return true;
            }
        }
        return false;
    }
    std::string Excute(const std::string &cmdstr)
    {
        if(!SafeCheck(cmdstr)) return "unsafe";
        std::string result;
        FILE *fp=popen(cmdstr.c_str(),"r");
        if(fp)
        {
            char line[1024];
            while(fgets(line,sizeof(line),fp))
            {
                result+=line;
            }
            return result.empty()?"success":result;
        }
        else
        {
            return "execute error";
        }
    }
    void HandlerCommand(int sockfd,InetAddr addr)
    {
        //长服务
        while(true)
        {
            char commandbuf[1024];
            ssize_t n=::recv(sockfd,commandbuf,sizeof(commandbuf)-1,0);
            if(n>0)
            {
                commandbuf[1024]=0;
                LOG(INFO,"get command from client %s, command: %s\n",addr.AddrStr().c_str(),commandbuf);
                std::string result=Excute(commandbuf);
                send(sockfd,result.c_str(),result.size(),0);
            }
            else if(n==0)
            {
                LOG(INFO,"client %s quit\n",addr.AddrStr().c_str());
                break;
            }
            else
            {
                LOG(ERROR,"read error: %s\n",addr.AddrStr().c_str());
                break;
            }
        }
    }
private:
std::set<std::string> _safe_command;
};